Numerical analysis of gas production from layered methane hydrate reservoirs by depressurization

Feng, Yongchang; Chen, Lin; Suzuki, Anna; Kogawa, Takuma; Okajima, Junnosuke; Komiya, Atsuki; Maruyama, Shigenao

doi:10.1016/j.energy.2018.10.184

Cited by 102 publications

(42 citation statements)

References 33 publications

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“…Sand production in field production tests can incur large costs due to production interruption [10,11]. Therefore, it is essential to perform numerical analysis before field production tests to improve their economic efficiency [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Permeability on Hydrate-Bearing Sediment Productivity and Stability in Ulleung Basin, East Sea, South Korea

et al. 2021

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Methane hydrate has attracted attention as a next-generation resource, and many researchers have conducted various studies to estimate its productivity. Numerical simulation is the optimal method for estimating methane gas productivity. Meanwhile, using a reasonable input parameter is essential for obtaining accurate numerical modeling results. Permeability is a geotechnical property that exhibits the greatest impact on productivity. The permeability of hydrate-bearing sediment varies based on the sediment pore structure and hydrate saturation. In this study, an empirical permeability model was derived from experimental data using soil specimens from the Ulleung Basin, and the model was applied in numerical analysis to evaluate the sediment gas productivity and ground stability. The gas productivity and stability of hydrate-bearing sediments were compared by applying a widely used permeability model and the proposed model to a numerical model. Additionally, a parametric study was performed to examine the effects of initial hydrate saturation on the sediment gas productivity and stability. There were significant differences in the productivity and stability analysis results according to the proposed permeability model. Therefore, it was found that for accurate numerical analysis, a regional permeability model should be applied.

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Section: Introductionmentioning

confidence: 99%

Effect of Permeability on Hydrate-Bearing Sediment Productivity and Stability in Ulleung Basin, East Sea, South Korea

et al. 2021

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“…Depressurization is a method that exploits gas hydrates by lowering the production pressure of development wells in hydrate-bearing strata to trigger hydrate dissociation after the pore pressure of reservoirs has decreased below the phase equilibrium pressure of hydrates. Moreover, the drawdown pressure drives the water and methane obtained through hydrate dissociation to flow into the wellbore . However, the decrease in the pore pressure certainly increases the effective stress, thus further compressing the strata notwithstanding the additional effect of hydrate dissociation in increased reservoir deformation .…”

Section: Introductionmentioning

confidence: 99%

Stratum Settlement during Depressurization of Horizontal Wells in Gas Hydrate Reservoirs

Cheng

Yan

et al. 2021

Energy Fuels

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The shallow burial of gas hydrates results in stratum settlement owing to pore pressure reduction and hydrate dissociation during depressurization. To understand this behavior in hydrate-bearing stratum, a numerical model for determining the nonlinear mechanical constitutive relation of hydrate-bearing sediments was developed based on the physical and mechanical properties of hydrate-bearing sediments. The model was compared with an ideal elastic–plastic model on the core scale. Furthermore, a model for stratum settlement during depressurization in horizontal wells in hydrate-bearing strata was also established. Variance and range analyses were conducted using an orthogonal design to explore the influences of various factors on the stratum settlement. The results show that when compared with the ideal elastic–plastic model, the established numerical model presents a higher accuracy when characterizing the deformation behaviors of hydrate-bearing sediments at different stress states. During exploitation from vertical wells, the stratum settlement center corresponds to the wellhead. However, in the horizontal well design, the upper strata of horizontal well sections also settle apart from the zones around the wellhead. The wellhead settlement of horizontal wells is attributed to the load-bearing effect of the upper strata and the compaction effect of the middle strata. The load on the wellhead decisively influences the wellhead settlement, which is positively correlated with the drawdown pressure, production time, and build angle rate but shows no obvious correlation with the length of horizontal wells. The drawdown pressure exerts the greatest influence on the settlement of the upper strata in horizontal well sections, and the influences of the production time and the length of the horizontal wells successively follow this.

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“…The comprehensive consideration of economical factor, energy recovery efficiency, implementation feasibility, and environmental impact infers that depressurization is accepted as the best potential method for utilizing the gas hydrate resource. Consequently, depressurization-induced gas production has been widely investigated recently [15][16][17][18][19][20][21]. The successful applications in field tests at the Mallik site [22], the eastern Nankai Trough [23,24], and the South China Sea [25] indicated the feasibility and effectiveness of depressurization both in terrestrial permafrost and marine hydrate deposits.…”

Section: Introductionmentioning

confidence: 99%

Effect of Perforation Interval Design on Gas Production from the Validated Hydrate-Bearing Deposits with Layered Heterogeneity by Depressurization

Xia

Yuan

et al. 2020

Geofluids

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Natural gas hydrate is considered as one of the best potential alternative resource to address the world’s energy demand. The available geological data at the Mallik site of Canada indicates the vertical heterogeneities of hydrate reservoir petrophysical properties. According to the logging data and sample analysis results at the Mallik 2L-38 well, a 2D model of geologically descriptive hydrate-bearing sediments was established to investigate the multiphase flow behaviors in hydrate reservoir induced by gas recovery and the effects of perforation interval on gas production performance. Firstly, the constructed model with vertical heterogeneous structures of permeability, porosity, and hydrate saturation was validated by matching the measured data in the Mallik 2007 test. The excessive residual methane in the hydrate reservoir observed in simulated results indicates insufficient gas production efficiency. For more effective methane recovery from a hydrate reservoir, the effect of perforation interval on long-term gas production performance was investigated based on the validated reservoir model. The simulation results suggest that both the location and length of the perforation interval have significant impact on hydrate dissociation behavior, while the gas production performance is mainly affected by the length of the perforation interval. To be specific, an excellent gas release performance is found in situations where the perforation interval is set at the interface between a hydrate reservoir and an underlying water-saturated zone. By increasing the perforation interval lengths of 5 m, 8 m, and 10 m, the gas release volumes from hydrate dissociation and gas production volumes from production wells are increased by 34%, 52%, and 57% and 37%, 58%, and 62%, respectively.

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Numerical analysis of gas production from layered methane hydrate reservoirs by depressurization

Cited by 102 publications

References 33 publications

Effect of Permeability on Hydrate-Bearing Sediment Productivity and Stability in Ulleung Basin, East Sea, South Korea

Effect of Permeability on Hydrate-Bearing Sediment Productivity and Stability in Ulleung Basin, East Sea, South Korea

Stratum Settlement during Depressurization of Horizontal Wells in Gas Hydrate Reservoirs

Effect of Perforation Interval Design on Gas Production from the Validated Hydrate-Bearing Deposits with Layered Heterogeneity by Depressurization

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